from datetime import datetime
from typing import Any, Optional

from pydantic import BaseModel, Field


class ExamCreate(BaseModel):
    title: str = Field(..., min_length=1, max_length=200)
    subject: str = ""
    grade: str = ""
    questions: list[dict[str, Any]] = []
    answers: list[Any] = []
    duration: int = 90
    total_score: int = 100
    difficulty: str = "medium"
    knowledge_points: list[str] = []


class ExamUpdate(BaseModel):
    title: Optional[str] = None
    subject: Optional[str] = None
    grade: Optional[str] = None
    questions: Optional[list[dict[str, Any]]] = None
    answers: Optional[list[Any]] = None
    duration: Optional[int] = None
    total_score: Optional[int] = None
    difficulty: Optional[str] = None
    knowledge_points: Optional[list[str]] = None


class ExamOut(BaseModel):
    id: int
    user_id: int
    title: str
    subject: str = ""
    grade: str = ""
    questions: list = []
    answers: list = []
    duration: int = 90
    total_score: int = 100
    difficulty: str = "medium"
    knowledge_points: list = []
    created_at: datetime | None = None
    updated_at: datetime | None = None

    model_config = {"from_attributes": True}